The family of a man who died in hospital nine days after being arrested have urged witnesses to contact the police watchdog.
The Independent Police Complaints Commission is investigating the circumstances surrounding the death of Darren Cumberbatch, who was arrested after an incident in Warwickshire on July 10.
Mr Cumberbatch was detained in Edward Street, Nuneaton, and later taken to the town's George Eliot Hospital, where he was admitted and de-arrested amid concern for his welfare.
Warwickshire Police have said Mr Cumberbatch's condition deteriorated on July 11 and he was transferred to an intensive care unit, where he died onWednesday.
Lawyers acting for bereaved family members have said an incident happened before Mr Cumberbatch was taken to hospital and it was "possible that a further relevant event" occurred after his arrival.
We are depending on the IPCC to conduct a robust investigation of what happened to Darren.
Warwickshire Police said a referral had been made to the IPCC under procedures governing death following police contact.
We are very saddened to hear of the death of this man and our deepest sympathies go out to his family. We will provide our full support to the IPCC. Warwickshire Police is unable to comment further at this time and will be assisting the IPCC with their inquiries.